The electrical properties of filled epoxy resin systems: a comparison

J.W. Mackersie, M.J. Given, S.J. MacGregor, R.A. Fouracre

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

3 Citations (Scopus)


The electrical properties of an epoxy resin system for use as machine insulation containing either ZnO or Al2O3 fillers have been investigated. The fillers impart non-linear current-voltage characteristics to the materials. The electrical conductivities of plaques of epoxy containing filler were a function of the applied electric field strength. The current-voltage relationship was dependent on the filler and differed from that for the unfilled material. The current transient as a result of an applied DC step voltage depended on the filler type and applied field strength. Multi-layer, plaque samples of mica-paper, glass-cloth and epoxy resin, with and without ZnO filler, were examined electrically. Current transient measurements allowed the estimation of the dielectric loss from ~10-5-10-1 Hz. Global thermally stimulated depolarisation current (TSDC) spectra were obtained. Partial polarisation spectra at 5°C intervals were also obtained from 35-150°C for unfilled and 20% ZnO filled samples. The spectra showed significant differences between sample types
Original languageEnglish
Title of host publicationProceedings of the 2001 IEEE 7th International Conference on Solid Dielectrics
Subtitle of host publicationICSD '01
Number of pages4
ISBN (Print)0-7803-6352-3
Publication statusPublished - Jun 2001
EventIEEE 7th International Conference on Solid Dielectrics, 2001. ICSD '01 - Eindhoven, Netherlands
Duration: 25 Jun 200129 Jun 2001


ConferenceIEEE 7th International Conference on Solid Dielectrics, 2001. ICSD '01


  • dielectric losses
  • dielectric polarisation
  • epoxy insulation
  • filled polymers


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